package com.demo.service;
public class UserService {
    public int insert() {
        System.out.println("添加用户信息");
        return 1;
    }
    public void delete() {
        System.out.println("删除用户信息");
    }
    public void update() {
        //int a=1/0;
        System.out.println("更新用户信息");
    }
    public void select() {
        System.out.println("查询用户信息");
    }
}